Drop 3.9 support

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.78%. Comparing base (ced88ea) to head (407eefd).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
- Coverage   97.28%   96.78%   -0.51%     
==========================================
  Files          13       13              
  Lines         811      809       -2     
  Branches       44       44              
==========================================
- Hits          789      783       -6     
- Misses         20       23       +3     
- Partials        2        3       +1     

Flag	Coverage Δ
unit	95.42% <ø> (-0.51%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #719 will improve performances by ×16

_{Comparing drop-39 (407eefd) with master (ced88ea)}

Summary

⚡ 1 improvement
✅ 62 untouched
⏩ 4 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_cache_hit_benchmark[func-bounded-ttl]	81.2 ms	4.9 ms	×16

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩